Centrifugal governor for internal combustion engines



J1me 1961 L. JAENTSCHKE ETAL 2,988,922

CENTRIFUGAL GOVERNOR FOR INTERNAL COMBUSTION ENGINES Filed Sept. 21,1956 2 Sheets-Sheet l 29 Fig. 7

III 11 June 1961 JAENTSCHKE ETAL 2,988,922

CENTRIF'UGAL GOVERNOR FOR INTERNAL COMBUSTION ENGINES Filed Sept. 21,1956 2 Sheets-Sheet 2 Fig. 3

a 3 o o 4 b /N VE N TOPS LEO/70427 J34N75CHK AND FOBEYT amps? B) and Unt d ta s, g am" 2,988,922 CENTRIFUGAL GOVERNOR FOR INTERNAL COMBUSTIONENGINES Leopold Jaentschke, Stuttgart-Bad Cannstatt, and Robert Binder,Stuttgart-Zulfenhausen, Germany, assignors to Firma Dr. Ing. h.c. F.Porsche K.G., Stuttgart-Zulrenhausen, Germany Filed Sept. 21, 1956, Ser.No. 611,112 Claims priority, application Germany Oct. 7, 1955 '6 Claims.(Cl. 73541) The present invention relates to a centrifugal -governor forinternal combustion engines, especially stationary motors whichcomprises an adjusting spring for adjusting the centrifugal governor toany desired control responsiveness as regards the number of rotations.

In known prior art constructions the control sleeve which is actuated bythe centrifugal weights is under the influence of a control spring whichis formed by one or several helical pressure springs arrangedconcentrically to the sleeve.

' In other known constructions a return spring operatively connectedwith the adjusting lever is provided for purposes of setting thegovernor to the desired rotational speed of the engine. In order toobtain a sufiicient spring volume, these types of springs, i.e., thecoil springs, become necessarily long and wide whereby the protectedaccommodation thereof is not possible or possible only with the aid of aseparate special spring bell-shaped member. o p

Furthermore, the adjustment of the control member by means of helicalsprings requires several transmission members as Well as guiding andsupporting members which must be machined accurately and which therebyincrease the cost of manufacture thereof.

According to the present invention, these disadvantages are avoided inthat the control spring is formed by a torsion springcooperating-withthe adjustment lever. Such a construction renders itpossible for the fly weights, together with the members associatedtherewith including the control spring, to be accommodated within alimited space whereby a handy adjusting control apparatus of relativelyslight dimensions is obtained.

The torsion rod spring is torsionally connected with an adjusting forkactuating the control sleeve. Such a construction provides aparticularly simple and reliable adjustment of the controller in whichexpensive guide and transmission members are obviated. The torsion rodspring extends through the shifting fork and is secured therein in areadily detachable manner by a tensioning or locking pin whereby thetorsion rod spring may be made relatively long without having anydetrimental influence on the dimensions of the housing so that asuificient torsion angle is available in operation. The most favorablespatial arrangement results if the torsion rod spring is arranged in theaxis of rotation of the adjusting lever and is rigidly connectedtherewith. An additional spring having an adjustable spring stiffness iscoordinated to this torsion rod spring. As a result of suchconstruction, larger rotational speed ranges may be adjusted. Preferablythe additional spring consists of a helical spring which supports itselfadjustably in the controller housing.

This enables a fine adjustment of the controller which makes it possibleto regulate aggregates such as generators and the like which areresponsive and sensitive to variations in the rotational speed thereof.

Accordingly, it is an object of the present invention to provide acentrifugal governor, especially for stationary installations which issimple in construction and offers the possibility of favorable layoutsas regards the spatial arrangement thereof.

Still another object of the present invention is the provision of acentrifugal governor for internal combustio engines which provides aspace-saving arrangement and which obviates the need for expensive guidemeans and transmission members requiring accurate machining.

A still further object of the present invention is the provision of acentrifugal governor which is highly sensitive to variations ordeviations from a predetermined speed and which makes possible fineadjustments and reg-.

ulations of the speed. 7

These and other objects, features and advantages of the presentinvention will become more obvious from the following description whentaken in connection with the accompanying drawing which shows, forpurposes of illustration only, one preferred embodiment in accordancewith the present invention and wherein:

FIGURE 1 is a side view of a centrifugal governor of an internalcombustion engine provided with a control spring in accordance with thepresent invention,

FIGURE 2 is a cross-sectional view taken along line IIII of FIGURE 1,and

FIGURE 3 is a cross-sectional view taken along line, line III-III ofFIGURE 2.

Referring now more particularly to the drawing, wherein like referencenumerals designate like parts, reference numeral 1 designates a housingwhich simultaneously carries the generator 2 of the engine. Acentrifugal gov-- ernor 3 is arranged within the housing 1. Thecentrifugal governor 3 consists of two fly weights 4 which act over asleeve 6 secured to the drive shaft 5 on a control pin 7, as is wellknown The control pin 7 is surrounded by a control sleeve 8 and abutswith the free end thereof against a control member 9. The control member'9 which is under the influence of the return spring 10'is operativelyconnected with a shaft 11 which transmits the control movement to anadjusting rod 12.

A shifting fork 14 is operatively connected by means of guide pins 13withthe control sleeve 8. The shifting fork 14 is rotatably supported bymeans of a bushing 15 in an eye 16 of the cover 17 closing thehousing 1. The bushing 15 as well as the shifting fork 14 is providedwith a bore 18 extending therethrough in which is arranged 'atorsion-rod spring 19 which is secured thereto in a readily detachablemanner by a tensioning or locking pin 20.

The torsion rod spring 19: is provided with an enlarged end 21 which isoperatively connected with an adjusting lever 22 and is rotatably guidedin the bearing bore 23 of the bushing 15 of the shifting fork 14. Theshifting fork 14 further comprises a stop or abutment member 24 formedintegrally therewith (FIGURE 3) which cooperates with the additionalspring 25. The additional spring 25 is formed by a helical spring whichabuts'adjustably in a threaded bushing 26 within the housing 1. Thethreaded bushing 26 is secured with respect to the housing 1 by means ofa nut 27.

- In operation if the shaft 5 rotates, the fly weights 4 are movedradially outwardly as a result of the centrifugal forces, whereby thecontrol pin 7 is forced against the control member 9, as is well known.By the adjustment of the pin 7 and of the control member 9 the controlrod 12 is adjusted correspondingly which in turn adjusts over a rodlinkage 28 the throttle valve 29 corresponding to the desired rotationalspeed of the internal combustion engine.

For purposes of adjusting a desired preselected rotational speed towhich the controller is responsive the adjusting lever 22 is actuatedwhereby the tension of the control spring constituted by the torsion rodspring 19 is changed. The torsion rod spring 19 influences over theshifting fork 14 and the control sleeve 8 the effect of the fly weights4 on the control member 9 which in turn determines the position of thethrottle valve 29. In order to adjust a larger rotational speedadjusting ents-9 Jam 961.

range as accurately as possible the additional spring 25 becomeseffective over the abutment member 24 after a predetermined annulardisplacement of the torsion rod spring 19. The strength of theadditional spring may be changed by loosening the nut 27 and adjustmentof the threaded bushing 26.

For purposes of adjusting a constant engine speed of rotation, as isrequired, for example, with generators, the position of the adjustinglever 22 may be fixed by a clamping bolt 30.

While we have shown and described one preferred embodiment in accordancewith the present invention, it is understood that the same is notlimited thereto. For example, instead of a separate additional spring,the torsion rod spring which forms the control spring may be providedwith corresponding abutments. Furthermore, the controller may be formedas an independent aggregate and may be arranged at any suitable place onthe internal combustion engine.

We claim:

' l. A centrifugal governor for internal combustion engines comprisingan output member, means mounting said output member for pivotalmovement, speed-responsive means operatively connected with said outputmemher to control the position thereof in dependence on the rotary speedof said speed-responsive means, said speedresponsive means comprising anaxially movable member including means having an abutment surfacethereon, said abutment surface intersecting the axis of said axiallymovable member, said output member having a portion intersecting theaxis of said axially movable member and abutting said abutment surface,said governor further comprising an adjusting lever supported in saidgovernor, and means including a torsion rod spring torsional.-

Iy connecting said speed-responsive means with said ad-- justing leverto adjustably control the responsiveness of said speed-responsive meansin dependence on the position of said adjusting lever, the axis of thesaid means mounting; said output member for pivotal movement beingspaced from the axis of said torsion spring, said speed-responsive meanscomprising. fly weights and a control sleeve operatively connected tosaid fly weights, said. means having an abutment surface thereon beingcomprised by a projecting pin on said axially movable member, said pinand said axially movable member being coaxial, and said. means includinga torsion rod Spring,

further including ashifting fork actuating said control sleeve,additional spring means coordinated to said torsion rod spring, and anabutment member extending outwardly from said fork cooperating with saidadditional spring means.

2. A centrifugal governor according to claim 1, wherein said additionalspring means is formed. by a coil spring, and means within saidcentrifugal governor for adjustably supporting said coil spring, theaxis of said coil spring being disposed transverse to the axis: of saidspeed responsive means.

3. A centrifugal governor comprising an output member, a rotatable shaftsupporting said output member,

speed responsive means comprising flyweights and a movable controlsleeve operatively connected to said flyweights, said movable controlsleeve having a control pin, said control pin being in contact with saidoutput member, said governor further comprising means for opposingmovement of. said control sleeve in one direction, said last-named meanscomprising a shifting fork in operative connection with said controlsleeve and having a hollow shaft, a torsion rod spring in said hollowshaft and secured to one end thereof, an adjusting lever on said torsionrod spring, the axis of said torsion rod spring being spaced from theaxis of said rotatable shaft.

4. A centrifugal governor according to claim 3, wherein said means foropposing movement of said control sleeve in one direction furthercomprises a coil spring, adjustable means for supporting said coilspring, and an abutment member on said shifting fork for cooperatingwith said coil spring.

5. A centrifugal governor according to claim 4, wherein said adjustablemeans comprises a threaded bushing receiving said coil spring.

6'. A centrifugal governor for internal combustion engines comprising anoutput member, means mounting said output member for pivotal movement,speed-responsive rneansoperatively' connected with said output member tocontrol the position thereof in dependence on the rotary speed of saidspeed-responsive means, said governor further comprising. an adjustinglever supported in said governor, and means including a torsion rodspring torsionally connecting said speed-responsive means with saidadjusting lever to adjustably control the responsiveness ofv saidspeed-responsive means in dependence on the position of said adjusting.lever, the axis of said means mounting said output member for pivotalmovement being. spaced from. the axis of said torsion spring, saidspeed-responsive means comprising fiy weights and a control. sleeveoperatively connected to said fly weights, said control. sleeve having apin thereon in contact with said output member, said means including atorsion rod spring further includinga shifting fork actuating saidcontrol sleeve, said torsion rod spring extending through said shiftingfork, and means for securing said torsion rod to said shifting. fork in.a readily detachable manner.

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